#include<iostream>
using namespace std;

int main()                //B2038,判断字符的ASCII码值的奇偶
{
    char ch;
    cin >> ch;
    if(ch%2 != 0)
    {
        cout << "YES\n";
    }
    else
    {
        cout << "NO\n";
    }
    return 0;
}